#include <iostream>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <functional>
#include <strings.h>
#include "Log.hpp"
#include "inetAddr.hpp"

using namespace LogModule;

using func_t = std::function<std::string (const std::string&, InetAddr&)>;

const int defaultfd = -1;

class UdpServer{
public:
    UdpServer(func_t func, uint16_t port)
        :_func(func), _port(port), _isrunning(false), _sockfd(defaultfd)
    {}

    void Init(){
        _sockfd = socket(AF_INET, SOCK_DGRAM, 0);
        if(_sockfd < 0){
            LOG(LogLevel::FATAL) << "socket error !!";
            exit(1);
        }
        LOG(LogLevel::INFO) << "socket success, socket: " << _sockfd;

        struct sockaddr_in local;
        bzero(&local, sizeof(local));
        local.sin_family = AF_INET;
        local.sin_port = htons(_port);
        local.sin_addr.s_addr = INADDR_ANY;

        int n = bind(_sockfd, (struct sockaddr*)&local, sizeof(local));
        if(n < 0){
            LOG(LogLevel::FATAL) << "bind error";
            exit(2);
        }
        LOG(LogLevel::INFO) << "bind success, sockfd: " << _sockfd;
    }

    void Start(){
        _isrunning = true;
        while(_isrunning){
            char buffer[1024];
            struct sockaddr_in peer;
            socklen_t len;
            int s = recvfrom(_sockfd, buffer, sizeof(buffer) - 1, 0, (struct sockaddr*)&peer, &len);
            if(s > 0){
                InetAddr client(peer);
                buffer[s] = 0;
                std::string result = _func(buffer, client);
                int n = sendto(_sockfd, result.c_str(), result.size(), 0, (struct sockaddr*)&peer, len);
                (void)n;
            }
        }
    }

private:
    int _sockfd;
    func_t _func;
    uint16_t _port;
    bool _isrunning;
};
